It is understandable why you feel this way, but there is not much to do about it.

Fat people are entitled to have preferences too. It just so happens that some BHMs like smaller girls and many BBWs seem to drool over athletic guys. I am sure there are BHMs who are FAs, BBWs who are FFAs and those who find people of all sizes attractive.

If you post a picture online, not everyone is going to like it. This applies even if you are a BBW posting in a thread for hetero male FAs. Some people are always bound to get more attention than others.